Instead, we use XModule field default values when creating an empty
XModule. Driven by this use case, we also allow for XModules to be
created in memory without being persisted to the database at all. This
necessitates a change to the Modulestore api, replacing clone_item with
create_draft and save_xmodule.

removed symbolset, replaced with fontawesome throughout for new buttons; updated old code for new button at bottom of grading to also use the FA style

typography, SASS import, mixins/extends

if user course creation is disabled & if staff email given, add link to request course creation by email

studio - page headers: added in logic to style page actions' height based on title having a subtitle or not

quick hack to give some protection from unauthorized users from making new courses. Make it so only is_staff people see the 'Create New Course' button.

don't show courses/create new course if account has not been activated. Also better error messaging on failed logins. Also redirect to index after signup.